A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

Vote Labor in Vic for traffic jams: PM

Those who want to avoid getting jammed up in Melbourne traffic need to vote Liberal in Saturday's state election, Prime Minister Tony Abbott says.

Using the last question time before Saturday to spruik Liberal premier Denis Napthine's struggling election campaign, he said Melbourne was a great city choking on its own traffic.

"I say to everyone who has ever been stuck in traffic on Hoddle Street, on Flemington Road, on Alexandra Parade, I say to all of those people - and that must be just about everyone in Melbourne - vote for the solution," he said.

Mr Abbott said only the Liberal-National state government was committed to building the East West Link which would cut travel time by 20 minutes for the occupants of 100,000 cars and trucks.

As well, it would create 4000 jobs for stage one, rising to 7000 for stage 2.

Treasurer Joe Hockey said Labor wanted to tear up 7000 new jobs associated with the East West Link.

"I'd say to the people of Victoria, if you care about 7000 new jobs, vote for the Liberal and National parties on Saturday," he said.